diner vs eating place

diner and eating place both are nouns.

Word	Noun	Adjective	Verb	Adverb
diner	Yes	No	No	No
eating place	Yes	No	No	No

As nouns, eating place is a hypernym of diner; that is, eating place is a word with a broader meaning than diner:

Other hypernyms of diner include eatery, eating house, restaurant.

diner (noun)	eating place (noun)
a passenger car where food is served in transit	a building where people go to eat
a restaurant that resembles a dining car
a person eating a meal (especially in a restaurant)